发明名称 |
METHOD OF DETERMINING THE MONITOR SENSITIVITY OF, AND METHOD AND SYSTEM FOR CONTROLLING A RADIATION EMITTING ARRANGEMENT, AND OPTICAL RECORDING AND/OR REPRODUCING APPARATUS INCLUDING SUCH A SYSTEM |
摘要 |
PHQ 89.003 METHOD OF DETERMINING THE MONITOR SENSITIVITY OF, AND METHOD AND SYSTEM FOR CONTROLLING A RADIATION EMITTING ARRANGEMENT, AND OPTICAL RECORDING AND/OR REPRODUCING APPARATUS INCLUDING SUCH A SYSTEM A method is described which enables automatic determination of the monitor sensitivity of a radiation emitting arrangement (in particular a laser diode and photodiode arrangement), which monitor sensitivity relates a level of a monitor signal (IM) generated by the arrangement to a corresponding optical output level (OL) of the arrangement. The method comprises the steps of: (i) supplying a varying drive signal (IL1,IL2) to the arrangement and measuring the rate of change (.DELTA.IM/.DELTA.IL) of the monitor signal (IM) with respect to the supplied drive signal (IL); and (ii) combining the measured rate of change with an assumed differential efficiency (k) of the arrangement to determine the monitor sensitivity (OL/IM) of the arrangement. The provision of a control system able to implement such a method can eliminate the need for a factory adjustment in the maufacture of apparatus such as optical recording and/or reproducing apparatus. (Figure 3)
|
申请公布号 |
CA2010788(A1) |
申请公布日期 |
1990.08.27 |
申请号 |
CA19902010788 |
申请日期 |
1990.02.23 |
申请人 |
N.V. PHILIPS' GLOEILAMPENFABRIEKEN |
发明人 |
MCGEE, PHILIP J. L. |
分类号 |
G11B7/125;H01S5/068;H01S5/0683;(IPC1-7):G01D18/00 |
主分类号 |
G11B7/125 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|